Cool idea, but needs a lot of balancing, queen is kind of overpowered. Also the sprites on the top should have the point filter instead of bilinear to make them not be blurry.
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Maybe make the camera bigger. In this games it is cool to see lots of units.
For the enemies, you could do what the original game does, which is to teleport the enemies to the boundaries of the camera so that the player can't run forever. Other option is to give the ability to spawn the enemies where you want them to with a minimap or a second camera.